Discussion
Assertion (A): Inside the two-phase region, pressure and temperature are not independent.
Reason (R): Along the saturation curve one fixes the other, so a further property such as quality is needed to locate the state.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the consequence. Inside the two-phase envelope the saturation relation ties pressure and temperature together, so specifying both fixes nothing beyond which saturation state it is. A second, independent property is needed - the quality, or equivalently the specific volume - to say where between the saturated liquid and saturated vapour the mixture lies.
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